Left-wing dictator and dictator's bird tailed (6)
I believe the answer is:
stalin
'left-wing dictator' is the definition.
(I know that Stalin is left-of-center)
I can't explain the remainder of the clue.
(Other definitions for stalin that I've seen before include "Notorious dictator of Latins" , "Dreaded dictator among Latins" , "Russian WW2 dictator" , "Russian tyrant" , "Soviet dictator, d. 1953" .)